119 
reports the following in the Coloradoan of the United States interior: 
Barbatia micronema; Brachydontes multilinigera; Ostrea anomioides. B. 
micronema is in the No. 1 bed of the Coalville section 1 , in association with 
Inoceramus labiatus and below the horizon of Prionotropis . The age 
of the Dunvegan is probably early Coloradoan. 
SMOKY RIVER FORMATION 
Kaskapau Member 
On Peace river, in the vicinity of Dunvegan, the base of the Kaskapau, 
or lower shale, member of the Smoky River formation, outcrops at the top 
of the cliffs. On Smoky river this member is exposed on the valley sides 
from below Puskwaskau river to about 12 miles below Racing creek. 
The dip is to the south. At the very base are friable dark shales, but 
most of the lower half of this member consists of dark, rather fissile, car- 
bonaceous shale. In the upper part are friable dark shales with concretions 
and at the very top, just below the Rad Heart sandstone member, are 
thin-bedded sandstones and shales. The estimated combined thickness 
of the Kaskapau and Bad Heart members on Smoky river is 550 feet. 
At the base of the formation on Smoky river is Cyprina sp. About 
60 or 70 feet above the base, in concretions in shale, at the rapid above 
the railway bridge on Smoky river, are: Inoceramus corpulentus McLearn; 
I. labiatus Schlotheim; Prionotropis cf. woolgari Mantell; Acanthoceras 
cf. coloradoensis Henderson. Higher in this member, and probably at 
about 200 feet above the base, Prionotropis re-occurs; fresh talus from a cliff 
on the east bank of Smoky river just above the mouth of Little Smoky river 
contains: Prionotropis caurinus McLearn; P. hyatti Stanton; Scaphites sp. 
A different fauna is found in the uppermost part of this member. 
In concretions just below the Bad Heart sandstone there occurs Inoceramus 
umbonatus Meek and Hayden. Somewhat lower and 40 or 50 feet below 
the base of the Bad Heart, Inoceramus albertensis McLearn was collected. 
The lower part of this member containing Prionotropis is correlated 
with the lower part of the Colorado shale of southwestern Alberta, with 
the lower part of the La Biche shales on Athabaska river, with the Carlile 
shale of the Black hills and of Wyoming, 2 and the Turonian of Europe. 
The age of the uppermost part of the Kaskapau member containing I, 
umbonatus, etc., is discussed below under Bad Heart sandstone, for I. 
umbonatus is a component of the Scaphites ventricosus fauna which is 
so well represented in the Bad Heart. 
Bad Heart Sandstone Member 
The Bad Heart sandstone is from 5 to 25 feet thick and outcrops in 
the cliffs on Smoky river from below Puskwaskau river nearly to the 
mouth of Little Smoky river. It consists of coarse sandstone and contains 
numerous marine fossils. The following were collected in place : Baculites 
cf. anceps Lamarck; Inoceramus pontoni McLearn; I. coulthardi McLearn; 
1 Stanton, T. W., U.S. Geol. Surv.,BulI. 106,pp.3S-40. 
1 For distribution of Prionotropi# fauna in the United States interior, see Reeside, J. B., jun. , U.S. Geol. Surv., 
Prof. Paper, 132 B, p. 26. 
